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authorPablo Neira Ayuso <pablo@netfilter.org>2018-06-03 00:38:50 +0300
committerPablo Neira Ayuso <pablo@netfilter.org>2018-06-03 01:02:11 +0300
commit371ebcbb9ee62fb46a0a27f358941588f7048678 (patch)
tree6ab7121e5735fbd75a2667385b66bd460d4dede6 /net/netfilter
parent79b174ade16d90302aef6e14f5eefd0b723c1602 (diff)
downloadlinux-371ebcbb9ee62fb46a0a27f358941588f7048678.tar.xz
netfilter: nf_tables: add destroy_clone expression
Before this patch, cloned expressions are released via ->destroy. This is a problem for the new connlimit expression since the ->destroy path drop a reference on the conntrack modules and it unregisters hooks. The new ->destroy_clone provides context that this expression is being released from the packet path, so it is mirroring ->clone(), where neither module reference is dropped nor hooks need to be unregistered - because this done from the control plane path from the ->init() path. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter')
-rw-r--r--net/netfilter/nf_tables_api.c12
-rw-r--r--net/netfilter/nft_counter.c1
2 files changed, 11 insertions, 2 deletions
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 12463984dd5c..0a6eafa49879 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -4046,8 +4046,16 @@ void nft_set_elem_destroy(const struct nft_set *set, void *elem,
nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
nft_data_release(nft_set_ext_data(ext), set->dtype);
- if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
- nf_tables_expr_destroy(&ctx, nft_set_ext_expr(ext));
+ if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) {
+ struct nft_expr *expr = nft_set_ext_expr(ext);
+
+ if (expr->ops->destroy_clone) {
+ expr->ops->destroy_clone(&ctx, expr);
+ module_put(expr->ops->type->owner);
+ } else {
+ nf_tables_expr_destroy(&ctx, expr);
+ }
+ }
if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
(*nft_set_ext_obj(ext))->use--;
kfree(elem);
diff --git a/net/netfilter/nft_counter.c b/net/netfilter/nft_counter.c
index e59a74d6b7d6..a61d7edfc290 100644
--- a/net/netfilter/nft_counter.c
+++ b/net/netfilter/nft_counter.c
@@ -258,6 +258,7 @@ static const struct nft_expr_ops nft_counter_ops = {
.eval = nft_counter_eval,
.init = nft_counter_init,
.destroy = nft_counter_destroy,
+ .destroy_clone = nft_counter_destroy,
.dump = nft_counter_dump,
.clone = nft_counter_clone,
};